Today's Lucky Item Is an Old Man

Moon Geun-Young has the worst luck imaginable, relying entirely on fortune apps to navigate life. His world takes an unexpected turn when he meets Team Leader Kang Joon-Suk, a man blessed with incredible luck.
Every time Geun-Young tries to get intimate, strange interruptions seem to arise. However, with Joonsuk, he finds himself having surprisingly enjoyable nights... that is, until he learns.... "Who knew he was married?"
Will Geun-Young be able to resist the subtle temptations of Kang Joon-Suk, who keeps inching closer—even at work?

(Source: Mr. Blue, translated)